The best way to judge your opponent's strength is not by seeing their lowest rating ever or their highest rating or anything like that. The best way to judge the strength of your opponent is by going through their games and seeing how well they play. I've seen someone rated 1100 lose to a person 900 but then beat a person 1500. Many players have certain strengths and weaknesses, by going through their games you can try to understand how they think.
Chess is a battle of minds, not battle of ratings. For example, my games with In His Name, he has lost to people that are rated 1700, yet I have beaten people that are rated 1900 and he has stumped me in our games because he thinks along a diff. line than I do. So in conclusion, having the lowest ever and highest ever ratings of players would not help in anyway.(in my opinion)